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Lett users of sparse propagation do their own thing with phi nodes if they want
to. This can be combined with LCSSA or SSI form to store more information on a PHINode than can be computed by looking at its incoming values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82317 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -72,6 +72,12 @@ public:
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virtual LatticeVal ComputeConstant(Constant *C) {
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return getOverdefinedVal(); // always safe
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}
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/// IsSpecialCasedPHI - Given a PHI node, determine whether this PHI node is
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/// one that the we want to handle through ComputeInstructionState.
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virtual bool IsSpecialCasedPHI(PHINode *PN) {
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return false;
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}
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/// GetConstant - If the specified lattice value is representable as an LLVM
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/// constant value, return it. Otherwise return null. The returned value
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@ -223,6 +223,13 @@ void SparseSolver::visitTerminatorInst(TerminatorInst &TI) {
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}
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void SparseSolver::visitPHINode(PHINode &PN) {
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if (LatticeFunc->IsSpecialCasedPHI(&PN)) {
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LatticeVal IV = LatticeFunc->ComputeInstructionState(PN, *this);
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if (IV != LatticeFunc->getUntrackedVal())
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UpdateState(PN, IV);
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return;
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}
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LatticeVal PNIV = getOrInitValueState(&PN);
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LatticeVal Overdefined = LatticeFunc->getOverdefinedVal();
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